Planck 2018 results. IX. Constraints on primordial non-Gaussianity
Abstract
We analyse the Planck full-mission cosmic microwave background (CMB) temperature and E-mode polarization maps to obtain constraints on primordial non-Gaussianity (NG). We compare estimates obtained from separable template-fitting, binned, and modal bispectrum estimators, finding consistent values for the local, equilateral, and orthogonal bispectrum amplitudes. Our combined temperature and polarization analysis produces the following results: f_NL^local = -0.9 +\- 5.1; f_NL^equil = -26 +\- 47; and f_NL^ortho = - 38 +\- 24 (68%CL, statistical). These results include the low-multipole (4 <= l < 40) polarization data, not included in our previous analysis, pass an extensive battery of tests, and are stable with respect to our 2015 measurements. Polarization bispectra display a significant improvement in robustness; they can now be used independently to set NG constraints. We consider a large number of additional cases, e.g. scale-dependent feature and resonance bispectra, isocurvature primordial NG, and parity-breaking models, where we also place tight constraints but do not detect any signal. The non-primordial lensing bispectrum is detected with an improved significance compared to 2015, excluding the null hypothesis at 3.5 sigma. We present model-independent reconstructions and analyses of the CMB bispectrum. Our final constraint on the local trispectrum shape is g_NLl^local = (-5.8 +\-6.5) x 10^4 (68%CL, statistical), while constraints for other trispectra are also determined. We constrain the parameter space of different early-Universe scenarios, including general single-field models of inflation, multi-field and axion field parity-breaking models. Our results provide a high-precision test for structure-formation scenarios, in complete agreement with the basic picture of the LambdaCDM cosmology regarding the statistics of the initial conditions (abridged).
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Cite
@article{arxiv.1905.05697,
title = {Planck 2018 results. IX. Constraints on primordial non-Gaussianity},
author = {Planck Collaboration and Y. Akrami and F. Arroja and M. Ashdown and J. Aumont and C. Baccigalupi and M. Ballardini and A. J. Banday and R. B. Barreiro and N. Bartolo and S. Basak and K. Benabed and J. -P. Bernard and M. Bersanelli and P. Bielewicz and J. R. Bond and J. Borrill and F. R. Bouchet and M. Bucher and C. Burigana and R. C. Butler and E. Calabrese and J. -F. Cardoso and B. Casaponsa and A. Challinor and H. C. Chiang and L. P. L. Colombo and C. Combet and B. P. Crill and F. Cuttaia and P. de Bernardis and A. de Rosa and G. de Zotti and J. Delabrouille and J. -M. Delouis and E. Di Valentino and J. M. Diego and O. Doré and M. Douspis and A. Ducout and X. Dupac and S. Dusini and G. Efstathiou and F. Elsner and T. A. Enßlin and H. K. Eriksen and Y. Fantaye and J. Fergusson and R. Fernandez-Cobos and F. Finelli and M. Frailis and A. A. Fraisse and E. Franceschi and A. Frolov and S. Galeotta and K. Ganga and R. T. Génova-Santos and M. Gerbino and J. González-Nuevo and K. M. Górski and S. Gratton and A. Gruppuso and J. E. Gudmundsson and J. Hamann and W. Handley and F. K. Hansen and D. Herranz and E. Hivon and Z. Huang and A. H. Jaffe and W. C. Jones and G. Jung and E. Keihänen and R. Keskitalo and K. Kiiveri and J. Kim and N. Krachmalnicoff and M. Kunz and H. Kurki-Suonio and J. -M. Lamarre and A. Lasenby and M. Lattanzi and C. R. Lawrence and M. Le Jeune and F. Levrier and A. Lewis and M. Liguori and P. B. Lilje and V. Lindholm and M. López-Caniego and Y. -Z. Ma and J. F. Macías-Pérez and G. Maggio and D. Maino and N. Mandolesi and A. Marcos-Caballero and M. Maris and P. G. Martin and E. Martínez-González and S. Matarrese and N. Mauri and J. D. McEwen and P. D. Meerburg and P. R. Meinhold and A. Melchiorri and A. Mennella and M. Migliaccio and M. -A. Miville-Deschênes and D. Molinari and A. Moneti and L. Montier and G. Morgante and A. Moss and M. Münchmeyer and P. Natoli and F. Oppizzi and L. Pagano and D. Paoletti and B. Partridge and G. Patanchon and F. Perrotta and V. Pettorino and F. Piacentini and G. Polenta and J. -L. Puget and J. P. Rachen and B. Racine and M. Reinecke and M. Remazeilles and A. Renzi and G. Rocha and J. A. Rubiño-Martín and B. Ruiz-Granados and L. Salvati and M. Savelainen and D. Scott and E. P. S. Shellard and M. Shiraishi and C. Sirignano and G. Sirri and K. Smith and L. D. Spencer and L. Stanco and R. Sunyaev and A. -S. Suur-Uski and J. A. Tauber and D. Tavagnacco and M. Tenti and L. Toffolatti and M. Tomasi and T. Trombetti and J. Valiviita and B. Van Tent and P. Vielva and F. Villa and N. Vittorio and B. D. Wandelt and I. K. Wehus and A. Zacchei and A. Zonca},
journal= {arXiv preprint arXiv:1905.05697},
year = {2019}
}
Comments
50 pages, 20 figures